多箱渡槽槽身静风三分力系数风洞试验研究

A wind tunnel test study on aerostatic coefficients of large scale multi-box aqueduct bridge deck

对6个多箱式渡槽槽身刚性测压模型进行了风洞试验研究,分别模拟了满槽、空槽以及不同风攻角的试验工况。根据试验结果得到了槽身模型的静风三分力(阻力、升力和扭矩)系数,讨论了模型风压分布以及三分力系数的变化规律。试验结果表明:(1)多箱式渡槽槽身绕流更趋近于钝体绕流;(2)槽身风荷载主要表现为风阻力;(3)阻力系数在总体趋势上随着槽截面宽高比的增加而减小。试验结果可为多箱渡槽的抗风研究与设计提供初步的参考。

A wind tunnel test for the six scaled multi-box aqueduct decks （including 3 two-box and 3 three-box models） was conducted. The cases with full and without water, and with different wind attack an- gles are considered respectively. The drag, lift and pitching moment coefficients of multi-box aqueduct decks were obtained by the test result analyses. The surface pressure distributions and the aerostatic coeffi- cients of the test models were displayed and discussed. The results show that： （1） The wind flow field around multi-box aqueduct deck is similar to that of blunt body; （2） The drag force is the most important wind load among the three static loads; （3） The drag coefficient decreases with the increasing of width/ height ratio of aqueduct decks in the whole tendency.